/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/GroupTopology.h
FTriangleGroupTopologyis a simplification ofFGroupTopologythat just represents a normal mesh. This allows algorithms to be written againstFGroupTopologythat will also work per-triangle. (However, there is enormous overhead to doing it this way!)
class FTriangleGroupTopology : public [UE::Geometry::FGroupTopology](API\Plugins\DynamicMesh\FGroupTopology)